Coal mining is recognized as a dangerous undertaking. Explosions of coal dust and gases that may exist underground (such as methane) are well-known hazards, in addition to which are unexpected structural collapses. In order to prevent the propagation of coal dust explosions, regulations require that inert rock dust is applied in underground areas of a coal mine. This project is aimed at creating real-time sensors to determine the explosibility of a coal and rock dust mixture and to communicate the results from inside the mine to safety personnel above ground.